BATON ROUGE, La. — LSU freshman Jeremy Hill announced his arrival as a big-time running back with both tackle-breaking power and breakaway speed on a 50-yard scoring run that was too much for South Carolina to overcome.

Hills finished with 124 yards and two touchdowns in his breakout performance, and the ninth-ranked Tigers handed No. 3 South Carolina its first loss of the season, 23-21 on Saturday night.

Three times, LSU settled for field goals after driving at least as far as the Gamecocks 5-yard line, and another drive to the South Carolina 15 stalled on a missed field goal.

But Hill's long score with 5:03 left gave LSU a nine-point lead that proved to be just enough cushion for the Tigers.

Connor Shaw drove South Carolina for a late TD on a short pass to Bruce Ellington with 1:41 left, and the Gamecocks got the ball once more with 35 seconds left, but LSU's defense held up.

Zach Mettenberger had the latest in a string of inconsistent performances but made enough big throws to sustain scoring drives, finishing 21 of 25 for 148 yards. He had one costly interception returned 70 yards by Jimmy Legree, setting up South Carolina's first TD.

Shaw finished 19 of 34 for 177 yards and two TDs, but was intercepted twice, once by Eric Reid to set up LSU's go-ahead field goal in the fourth quarter, and then on the final desperate play by Craig Loston.

LSU's second field goal cut South Carolina's lead to 14-13 early in the fourth quarter, then LSU was right back in scoring range when Shaw overthrew an open receiver and the ball landed in Reid's lap.

Reid returned it to the Gamecocks 22, then LSU drove to the 5 before settling for its third field goal to take a 16-14 lead.

Marcus Lattimore had a quiet night by his standards, gaining only 35 yards on 13 carries, but had given the Gamecocks a 14-10 lead in the third quarter when he impressively broke Reid's tackle on a 2-yard scoring run.

Under heavy criticism after failing to produce at touchdown in a loss a week earlier at Florida, LSU's offense was down to only two opening day starters on the line because right guard Josh Williford was unable to return from a concussion and right tackle Alex Hurst was excused for personal reasons.

Still, the unit opened by driving 69 yards on 16 plays, but settled for a field goal after freshman right tackle Vadal Alexander, elevated to starter two weeks earlier, was flagged for a false start on fourth-and-goal from the 1.

The Tigers were moving on their second series as well until Mettenberger's only major mistake, on Legree's interception, which was returned to the LSU 1. That set up Ace Sanders' short TD catch to give South Carolina a 7-3 lead early in the second quarter.

After both teams' first four possessions, LSU had a 179-34 advantage in offensive yards, and a 10-2 advantage in first downs, but still trailed 7-3.

The Gamecocks were threatening to build on their lead late in the second quarter, but Josh Downs' sack for a loss of 10 yards to the LSU forced a punt.

That allowed LSU to surge back in front on Hill's 7-yard touchdown on the first series of the second half.